the GNU version of the Collaborative International Dictionary of English
n. An accumulation of serous fluid in the cavity of the chest.
The Century Dictionary and Cyclopedia
n. In pathology, the presence of serous fluid in one or both pleural cavities.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys
Word Usage
"The accumulation in the chest is called hydrothorax, or dropsy of the chest."